On Mon, 24 Feb 2014 09:00:43 -0500, Shmuel Metz (Seymour J.) wrote: > on 02/23/2014 at 08:09 PM, DASDBILL2 said: > >>Just for future reference, since the name of this list-server is IBM >>Mainframe Discussion List, what particular IBM�systems, other than >>System/360 and its descendants, are also called mainframe systems? > >Large machines older than S/360, plus some non-IBM machines that would >be out of scope here. ... > Surely, when comparing technologies hardware and software from other vendors should not be considered off-charter.
Hmmm... The PDP-6, for example, had no data channels. All I/O was performed by the CPU, usually in interrupt handlers. And the hardware architecture was such that such an interrupt handler could be coded in a single instruction (plus one more to dismiss the interrupt). An amusing idea with short life expectancy. -- gil ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
